Incentive Compensation Plans Schedule of Stock-based Compensation Expense (Tables)

12 Months Ended

Dec. 31, 2017

Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]

Schedule of Stock-based Compensation Expense

The amounts of stock-based compensation expense as reflected in salaries and related expenses in our Consolidated Statements of Operations, and the related tax benefit, are listed below.

	Years ended December 31,
	2017		2016		2015
Stock options	$	0.0	$	0.2	$	1.0
Stock-settled awards	20.5		16.0		11.6
Cash-settled awards	1.0		0.9		0.7
Performance-based awards	61.5		69.4		57.7
Employee stock purchase plan	1.0		0.7		0.7
Other 1	0.5		0.8		0.9
Stock-based compensation expense	$	84.5	$	88.0	$	72.6
Tax benefit	$	30.4	$	32.1	$	26.3

1 Represents charges recorded for severance expense related to stock-based compensation awards.